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User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/59.0.3071.115 Safari/537.36
Steps to reproduce:
Expanded the example uploaded for bug report 1377581 to report the isIntersecting property on the only entry provided to the callback.
Actual results:
Property came back as undefined. Same code gave me true/false (i.e. the expected boolean) in current Chrome.
Expected results:
Chrome devs do not meet MDN specification with regards to crossing the threshold outwards (false) or inwards (true). Any ratio > 0 is true for them. Would be nice if FireFox could get this right.

Ok, I could see in other bug reports that you are testing this in FF 54. And, yes, I was able to reproduce the reported issue. Support for the isIntersecting property landed via Bug 1319137 and will be available in FF 55.